Multifunctional pressure-bearing solar heat preservation water tank

Abstract

The utility model relates to the technical field of solar water heaters, in particular to a multifunctional pressure-bearing solar heat preservation water tank which comprises a heat preservation water tank body, a heat exchange layer, a pressure-bearing inner container, a water inlet pipe and a water outlet pipe. The heat preservation water tank is an integral shell and used for containing the heat exchange layer and the pressure-bearing inner container. The pressure-bearing inner container is of an eccentric structure. The joints of the heat exchange layer, the pressure-bearing liner body and the cambered surface part are welded together, so that the cambered surface part protrudes towards the outside of the heat exchange layer; a water supply port is formed in the cambered surface part at one end of the pressure-bearing liner, and a water outlet is formed in the cambered surface part at the other end; the water inlet pipe penetrates through the heat-preservation water tank and is connected with the water supply The water outlet pipe penetrates through the heat preservation water tank and is connected with the water outlet, penetrating through the three-layer structure is avoided, weld cracks and leakage risks caused by difference of thermal expansion coefficients of different materials are eliminated, the welding process is optimized, and the overall performance and production feasibility of the water tank are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to solar water heater technical field, concretely relates to a multifunctional pressure-bearing solar heat preservation water tank. BACKGROUND

[0002] In recent years, with the rapid development of solar technology, the pressure-bearing solar water heating system is widely used in the solar field because of its high pressure-bearing property, stable heat exchange efficiency and the characteristics of adapting to centralized water supply, and becomes an important choice for many users to obtain hot water. However, the eccentric pressure-bearing structure of the solar heat preservation water tank in the prior art has the following technical problems in large-scale production:

[0003] 1. The inlet and outlet pipes need to penetrate the three-layer structure of the heat preservation layer, the heat exchange layer and the pressure-bearing inner container, resulting in multiple heterogeneous material welding. The difference in the thermal expansion coefficients of different materials makes the welding seam prone to cracks due to thermal stress when the temperature changes, thereby causing leakage risk. Not only does it affect product quality, but it may also cause safety hazards during user use.

[0004] 2. The pipe welding needs to be implemented after multiple nesting, and the operation space is extremely limited. It is difficult to accurately position during the welding process, and the skill of the operator and the welding equipment are extremely high. A slight deviation in positioning accuracy will result in substandard welding quality. The positioning accuracy requirement is harsh, which makes the process complex, the rework rate high, seriously restricts the production efficiency, and increases the production cost.

[0005] In order to solve the problems existing in the prior art, it is necessary to develop a heat preservation water tank that can eliminate the production difficulty caused by penetrating the three-layer structure and optimize the welding process, comprehensively improve the overall performance and production feasibility of the solar heat preservation water tank, and promote the development of the pressure-bearing solar water heating system industry to a higher quality and higher efficiency. SUMMARY

[0006] To solve the above problems, the utility model provides a multifunctional pressure-bearing solar heat preservation water tank, which welds the connection between the heat exchange layer and the pressure-bearing inner container body and the arc surface part. The arc surface part protrudes outward from the heat exchange layer. The two arc surface parts are respectively provided with a water inlet and a water outlet. The inlet and outlet pipes are connected only through the corresponding interfaces of the heat preservation water tank and the pressure-bearing inner container, avoiding penetration of the three-layer structure, eliminating the welding seam cracks and leakage risk caused by the difference in the thermal expansion coefficients of different materials, optimizing the welding process, and improving the overall performance and production feasibility of the water tank.

[0007] Specifically, this utility model provides a multifunctional pressure-bearing solar-powered insulated water tank, including an insulated water tank, a heat exchange layer, a pressure-bearing inner liner, an inlet pipe, and an outlet pipe. The insulated water tank is an integral outer shell used to house the heat exchange layer and the pressure-bearing inner liner. The pressure-bearing inner liner has an eccentric structure, including a pressure-bearing inner liner body and arc-shaped surfaces at both ends. The heat exchange layer is welded together with the pressure-bearing inner liner body and the arc-shaped surfaces, so that the arc-shaped surfaces protrude outward from the heat exchange layer. A water supply port is opened on one end of the arc-shaped surface of the pressure-bearing inner liner, and a water outlet is opened on the other end of the arc-shaped surface. The inlet pipe passes through the insulated water tank and is connected to the water supply port. The outlet pipe passes through the insulated water tank and is connected to the outlet.

[0008] Furthermore, on the arc-shaped surface of the pressure-bearing inner tank at the outlet end, there are an upper circulation port for a water circulation heat pump and a horizontally mounted heat pump probe port; the upper circulation port for the water circulation heat pump is used to introduce hot water from the pressure-bearing inner tank into the water circulation heat pump to achieve heat exchange circulation; the horizontally mounted heat pump probe port is used to install a horizontally set temperature probe to monitor the water temperature at the corresponding position inside the pressure-bearing inner tank.

[0009] Furthermore, on the arc-shaped surface of the pressure-bearing inner tank at the water supply end, there are a water circulation heat pump lower circulation port and an inclined heat pump probe port.

[0010] The lower circulation port of the water circulation heat pump is used to return the water after heat exchange by the water circulation heat pump to the pressure tank.

[0011] The tilted heat pump probe port is used to install a tilted temperature probe to monitor the water temperature inside the pressurized inner tank from different angles.

[0012] Furthermore, the heat exchange layer is provided with a heat exchange layer exhaust port and a refrigerant cycle heat pump coil hole; the heat exchange layer exhaust port is used to discharge the air generated or accumulated in the heat exchange layer during operation;

[0013] The fluorine cycle heat pump coil hole is used to install the fluorine cycle heat pump coil, enabling the fluorine cycle system to exchange heat with the medium in the heat exchange layer through the coil.

[0014] Furthermore, a water replenishment tank is installed above the insulated water tank, and the water replenishment tank is connected to an external water source via a water replenishment pipe; a water replenishment valve is installed on the water replenishment pipe to control the flow of water to the water replenishment tank; upstream of the water replenishment valve, the water replenishment pipe is connected to the inlet pipe according to the direction of water flow, and a water supply valve is installed on the inlet pipe to control the flow of water into the pressure-bearing inner tank; an inlet valve is also installed upstream of the connection between the water replenishment pipe and the inlet pipe to control the flow of water into the water replenishment tank or the pressure-bearing inner tank;

[0015] When it is necessary to fill the water tank, open the inlet valve and the water supply valve, and close the water supply valve at the same time. The water will then flow into the water tank along the water supply pipe, allowing the water tank to fill with water.

[0016] In the normal water supply stage, the water inlet valve and the water supply valve are opened, and the water supplement valve is closed, at this time the water flow is directly from the water inlet pipe into the pressure inner container;

[0017] When the water supply is stopped in special circumstances, the water inlet valve is closed, and the water supplement valve and the water supply valve are opened, so that the water flow along the water supplement pipe flows into the pressure inner container to complete the water supplement.

[0018] Further, it also includes a vacuum tube and a bracket; one end of the vacuum tube is sealedly connected with the heat exchange layer through the heat preservation water tank, and the other end is fixedly connected with the bracket, for absorbing solar heat and transferring to the heat exchange layer; the heat preservation water tank is installed on the bracket, and the bracket is used for supporting and fixing the heat preservation water tank and the vacuum tube.

[0019] Working principle: Before the operation of the multifunctional pressure solar heat preservation water tank, the operator first needs to weld the pipe openings of the heat preservation water tank 14, the heat exchange layer 5 and the pressure inner container 4 with the corresponding connecting pipes to ensure good sealing. Then, the heat preservation water tank 14 is fixedly installed on the bracket 12, and then the one end of the vacuum tube 11 is sealedly connected with the heat exchange layer 5 through the heat preservation water tank 14, and the other end is fixed with the bracket 12.

[0020] After preparation, cold water is introduced through the water inlet pipe 13 to prepare for subsequent heating. The vacuum tube 11 begins to absorb solar heat and transfer the heat to the heat exchange layer 5 sealedly connected therewith, at this time the water tank enters the heat exchange circulation link, which can be realized through the fluorine circulation or water circulation system.

[0021] When the fluorine circulation system is used, the operator needs to block the circulation port 1 of the water circulation heat pump and the lower circulation port 3 of the water circulation heat pump in advance, so that the fluorine circulation coil is smoothly installed in the heat exchange layer 5 through the fluorine circulation coil hole 9. When working, the low-temperature and low-pressure freon flows into the coil, absorbs heat from the medium in the heat exchange layer 5, and its state changes to high-temperature and high-pressure gas, and then the heat of the medium in the water tank is transferred to the fluorine circulation system, so as to adjust the heat distribution in the water tank and maintain the stability of the water temperature.

[0022] If the water circulation system is enabled, the fluorine circulation coil hole 9 needs to be blocked. The hot water in the inner container is introduced into the water circulation heat pump through the upper circulation port 1 of the water circulation heat pump of the arc surface part 42 of one end of the pressure inner container, and the heat exchange circulation is completed; the water after heat exchange by the heat pump returns to the pressure inner container through the lower circulation port 3 of the heat pump.

[0023] At the same time, different angle temperature probes are installed at the horizontal installation heat pump probe port 8 and the inclined installation heat pump probe port 10 respectively opened at the arc surface parts 42 of both ends of the pressure inner container, to monitor the water temperature in the inner container, and help to accurately grasp the operation state of the whole water tank system.

[0024] When the hot water is heated, the hot water is sent out through the water outlet pipe 19 to meet the user's demand. During the operation of the water tank, the heat exchange layer exhaust port 6 can timely discharge the air generated or accumulated. Since the air can interfere with heat transfer, timely air discharge can ensure that the medium in the heat exchange layer is in close contact with the fluorine circulating coil, guarantee efficient and stable heat exchange, and improve the overall heat exchange effect.

[0025] Advantages:

[0026] 1. The water inlet pipe and the water outlet pipe only pass through the heat preservation water tank and are connected with the water supply port and the water outlet on the arc surface of the two ends of the pressure-bearing inner container; the pressure-bearing inner container is provided with a water circulation heat pump upper circulation port and a water circulation heat pump lower circulation port, and the water circulation heat pump pipeline can only pass through the heat preservation water tank and be connected with the pressure-bearing inner container; the pressure-bearing inner container is also provided with an inclined installation heat pump probe port and a horizontal installation heat pump probe port, and when the temperature probe is installed, it only needs to pass through the heat preservation water tank and be connected with the pressure-bearing inner container. The number of layers of dissimilar material welding is greatly reduced, the risk of cracks at the welding seam due to the difference in the thermal expansion coefficient of different materials is effectively avoided, the product quality and use safety are significantly improved. At the same time, the welding process is simplified, the operation difficulty is reduced, the production efficiency is improved, and the production cost is also reduced.

[0027] 2. The water circulation heat pump upper circulation port is pre-set, the hot water in the pressure-bearing inner container can be introduced into the water circulation heat pump, so that heat exchange circulation is realized. The heating mode of the water tank is expanded, and in the case of insufficient solar energy, auxiliary heating can be assisted by the heat pump to ensure stable hot water supply.

[0028] 3. The horizontal installation heat pump probe port and the inclined installation heat pump probe port are pre-set for respectively installing the horizontal temperature probe and the inclined temperature probe. These probes can accurately monitor the water temperature at the corresponding position, provide data basis for heat pump circulation and overall operation regulation of the water tank, realize accurate temperature control, and effectively improve the energy utilization efficiency.

[0029] 4. The heat exchange layer is provided with a heat exchange layer exhaust port, which can timely discharge the air generated or accumulated during operation, ensure that the internal medium is in close contact with the fluorine circulating heat pump coil, improve the heat exchange efficiency, make the heat exchange process efficient and stable, reduce energy waste, and prolong the service life of the equipment.

[0030] 5. The fluorine circulation system is used to realize efficient heat exchange, adjust the heat distribution in the water tank, maintain stable water temperature, and enhance the ability of the water tank to cope with different environments.

[0031] 6. The utility model discloses a water supplementing tank is installed above the heat preservation water tank, and the water supplementing tank is welded with the water supply opening of pressure bearing inner bag through the connecting hole of water supplementing pipe and the heat preservation water tank, and the water supplementing pipe is welded with the connecting hole. Can supplement water source for pressure bearing inner bag in time, guarantees the heat preservation water tank to continue steady water supply, is especially applicable to the scene of big water consumption or unstable water source. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is whole structure schematic drawing of the utility model;

[0033] Figure 2 It is heat preservation water tank sectional view no. 1 of the utility model;

[0034] Figure 3 It is heat preservation water tank sectional view no. 2 of the utility model;

[0035] Figure 4 It is heat preservation water tank sectional view no. 3 of the utility model;

[0036] Figure 5 It is heat preservation water tank, heat exchange layer and pressure bearing inner bag sectional view of the utility model;

[0037] Figure 6 It is heat preservation water tank schematic drawing no. 1 of the utility model;

[0038] Figure 7 It is heat preservation water tank schematic drawing no. 2 of the utility model;

[0039] Figure 8 It is heat preservation water tank schematic drawing no. 3 of the utility model;

[0040] Figure 9 It is heat preservation water tank, heat exchange layer and pressure bearing inner bag internal structure schematic drawing of the utility model;

[0041] Figure 10 It is heat preservation water tank, heat exchange layer and pressure bearing inner bag side view of the utility model;

[0042] Figure 11 It is heat preservation water tank, heat exchange layer and pressure bearing inner bag side view of the utility model;

[0043] Marked number in drawing: 1 - water circulation heat pump upper circulation port, 2 - water supply port, 3 - water circulation heat pump lower circulation port, 5 - heat exchange layer, 6 - heat exchange layer exhaust port, 7 - water outlet, 8 - horizontally installed heat pump probe port, 9 - fluorine circulation heat pump coil hole, 10 - obliquely installed heat pump probe port, 11 - vacuum tube, 12 - support, 13 - water inlet pipe, 14 - heat preservation water tank, 15 - water supplementing tank, 16 - water supplementing pipe, 17 - water supplementing valve, 18 - water supply valve, 19 - water outlet pipe, 20 - water inlet valve;

[0044] 4—Pressure-bearing inner liner, 41—Pressure-bearing inner liner body, 42—Curved surface. Detailed Implementation

[0045] The technical solution will now be described in detail with reference to the accompanying drawings of the embodiments of this utility model.

[0046] Example 1

[0047] like Figures 1-4 As shown, a multifunctional pressurized solar-heated water tank includes: an upper circulation port 1 of a water circulation heat pump, a lower circulation port 3 of a water circulation heat pump, a water supply port 2, a pressurized inner tank 4, a pressurized inner tank body 41, an arc-shaped surface 42, a heat exchange layer 5, a heat exchange layer exhaust port 6, a water outlet 7, a horizontally installed heat pump probe port 8, a refrigerant circulation heat pump coil hole 9, an inclinedly installed heat pump probe port 10, a vacuum tube 11, a bracket 12, a water inlet pipe 13, a heat-insulated water tank 14, a water replenishment tank 15, a water replenishment pipe 16, a water replenishment valve 17, a water supply valve 18, a water outlet pipe 19, and a water inlet valve 20.

[0048] like Figure 6 As shown, the insulated water tank 14 is an integral outer shell used to house the heat exchange layer 5 and the pressure-bearing inner liner 4; its interior also houses the heat exchange layer 5 and the pressure-bearing inner liner 4. The insulated water tank 14 has pre-drilled connection holes for connecting to other components.

[0049] like Figure 11 As shown, the pressure-bearing inner liner 4 has an eccentric structure; the heat exchange layer 5 is welded together with the pressure-bearing inner liner body 41 and the arc-shaped part 42, so that the arc-shaped part protrudes outward from the heat exchange layer 5; a water supply port 2 is opened on the arc-shaped part 42 at one end of the pressure-bearing inner liner 4, and a water outlet 7 is opened on the arc-shaped part 42 at the other end; the water inlet pipe 13 passes through the insulated water tank 14 and is connected to the water supply port 2; the water outlet pipe 19 passes through the insulated water tank 14 and is connected to the water outlet 7.

[0050] like Figure 6 , 10 As shown, the pressure-bearing inner tank 4 has an arc-shaped surface 42 with a water outlet 7, and a water circulation heat pump upper circulation port 1 and a horizontally installed heat pump probe port 8 are provided. The water circulation heat pump upper circulation port 1 is used to introduce hot water from the pressure-bearing inner tank 4 into the water circulation heat pump to achieve heat exchange circulation. The horizontally installed heat pump probe port 8 is used to install a horizontally set temperature probe to monitor the water temperature at the corresponding position inside the pressure-bearing inner tank 4.

[0051] like Figure 3 , 11As shown, the pressure inner container 4 is provided with the arc surface part 42 of the water supply port 2, and the water circulation heat pump lower circulation port 3 and the obliquely installed heat pump probe port 10 are arranged on the arc surface part 42; the water circulation heat pump lower circulation port 3 is used for returning the water after heat exchange by the water circulation heat pump to the pressure inner container 4; and the obliquely installed heat pump probe port 10 is used for installing the obliquely arranged temperature probe to monitor the water temperature in the pressure inner container 4 from different angles.

[0052] As shown in Figure 11 As shown, the heat exchange layer exhaust port 6 and the fluorine circulation heat pump coil hole 9 are arranged on the heat exchange layer 5; the heat exchange layer exhaust port 6 is used for exhausting the air generated or accumulated in the heat exchange layer 5 during operation; and the fluorine circulation heat pump coil hole 9 is used for installing the fluorine circulation coil, so that the fluorine circulation system can exchange heat with the medium in the heat exchange layer 5 through the coil.

[0053] As shown in Figure 1 As shown, the upper part of the heat preservation water tank 14 is provided with a water supplement tank 15, and the water supplement tank 15 is connected with an external water source through a water supplement pipe 16; a water supplement valve 17 is arranged on the water supplement pipe 16, and is used for controlling the opening and closing of the water flow to the water supplement tank 15; according to the water flow direction, the water supplement pipe 16 is connected with the water inlet pipe 13 upstream of the water supplement valve 17, and a water inlet valve 18 is arranged on the water inlet pipe 13, and is used for controlling the opening and closing of the water flow into the pressure inner container 4; and a water inlet valve 20 is further arranged upstream of the connection part of the water supplement pipe 16 and the water inlet pipe 13, and is used for controlling the water flow into the water supplement tank 15 or the pressure inner container 4.

[0054] When it is necessary to add water to the water supplement tank 15, the water inlet valve 20 and the water supplement valve 17 are opened, and the water supply valve 18 is closed, so that the water flow enters the water supplement tank 15 along the water supplement pipe 16, and the water supplement tank 15 completes water storage.

[0055] In the normal water supply stage, the water inlet valve 20 and the water supply valve 18 are opened, and the water supplement valve 17 is closed, so that the water flow directly enters the pressure inner container 4 from the water inlet pipe 13.

[0056] When the water supply is stopped in a special situation, the water inlet valve 20 is closed, and the water supplement valve 17 and the water supply valve 18 are opened, so that the water flow flows into the pressure inner container 4 along the water supplement pipe 16, and the water supplement is completed.

[0057] As shown in Figure 5 As shown, one end of the vacuum tube 11 penetrates through the heat preservation water tank 14 and is sealingly connected with the heat exchange layer 5, and the other end is fixedly connected with the support 12, and is used for absorbing solar heat and transferring the solar heat to the heat exchange layer 5; the heat preservation water tank 14 is installed on the support 12, and the support 12 is used for supporting and fixing the heat preservation water tank 14 and the vacuum tube 11.

[0058] As shown in Figure 1As shown, before the multifunctional pressure-bearing solar heat preservation water tank is operated, the operator first needs to weld the pipe openings of the heat preservation water tank 14, the heat exchange layer 5 and the pressure-bearing inner container 4 to the corresponding connecting pipes to ensure good sealing. Then, the heat preservation water tank 14 is fixedly installed on the support 12, and then one end of the vacuum tube 11 is connected in a sealed manner with the heat exchange layer 5 through the heat preservation water tank 14, and the other end is fixed with the support 12.

[0059] After preparation, cold water is introduced through the water inlet pipe 13 to prepare for subsequent heating. The vacuum tube 11 starts to absorb solar heat and transfer the heat to the heat exchange layer 5 connected in a sealed manner. At this time, the water tank enters the heat exchange cycle link, which can be realized through a fluorine circulation or water circulation system.

[0060] When the fluorine circulation system is used, the operator needs to block the upper circulation port 1 and the lower circulation port 3 of the water circulation heat pump in advance, so that the fluorine circulation coil is smoothly installed in the heat exchange layer 5 through the fluorine circulation heat pump coil hole 9. When working, low-temperature and low-pressure freon flows into the coil, absorbs heat from the medium in the heat exchange layer 5, and its state changes to high-temperature and high-pressure gas, and then the heat of the medium in the water tank is transferred to the fluorine circulation system to adjust the heat distribution in the water tank and maintain the stability of the water temperature.

[0061] If the water circulation system is enabled, the fluorine circulation heat pump coil hole 9 needs to be blocked. The hot water in the inner container is introduced into the water circulation heat pump through the upper circulation port 1 of the water circulation heat pump of the arc surface part 42 at one end of the pressure-bearing inner container, and the heat exchange cycle is completed; the water after heat exchange by the heat pump flows back to the pressure-bearing inner container through the lower circulation port 3 of the water circulation heat pump.

[0062] At the same time, at the horizontal heat pump probe port 8 and the inclined heat pump probe port 10 respectively formed in the arc surface parts 42 at both ends of the pressure-bearing inner container, temperature probes of different angles are installed to monitor the water temperature in the inner container and help accurately grasp the operating state of the entire water tank system.

[0063] After the hot water is heated, the hot water is sent out through the water outlet pipe 19 to meet the user's demand. During the operation of the water tank, the heat exchange layer exhaust port 6 will timely exhaust the generated or accumulated air. Since air will interfere with heat transfer, timely exhaust can ensure that the medium in the heat exchange layer is in close contact with the fluorine circulation coil, so as to ensure efficient and stable heat exchange and improve the overall heat exchange effect.

[0064] It should be understood that the above specific embodiments of the present application are merely used for illustrative or explanatory purposes of the principles of the present application, and do not constitute a limitation on the present application. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present application shall be included in the protection scope of the present application. In addition, the appended claims of the present application are intended to cover all variations and modifications falling within the scope and boundary of the appended claims, or the equivalent forms of such scope and boundary.

Claims

1. A multifunctional pressure-bearing solar heat-insulated water tank, comprising a heat-insulated water tank (14), a heat exchange layer (5), a pressure-bearing inner container (4), a water inlet pipe (13), and a water outlet pipe (19); characterized in that: the heat-insulated water tank (14) is a whole shell for containing the heat exchange layer (5) and the pressure-bearing inner container (4); the pressure-bearing inner container (4) is in an eccentric structure, comprising a pressure-bearing inner container body (41) and arc surface parts (42) at both ends; the heat exchange layer (5) and the connecting parts of the pressure-bearing inner container body (41) and the arc surface parts (42) are welded together, so that the arc surface parts protrude outward from the heat exchange layer (5); the arc surface part (42) at one end of the pressure-bearing inner container (4) is provided with a water supply port (2), and the arc surface part (42) at the other end is provided with a water outlet port (7); the water inlet pipe (13) passes through the heat-insulated water tank (14) and is connected with the water supply port (2); and the water outlet pipe (19) passes through the heat-insulated water tank (14) and is connected with the water outlet port (7). The arc surface part (42) at one end of the pressure-bearing inner container (4) is provided with a water circulation heat pump upper circulation port (1) and a horizontally installed heat pump probe port (8); the water circulation heat pump upper circulation port (1) is used for leading hot water in the pressure-bearing inner container (4) into a water circulation heat pump to realize heat exchange circulation; and the horizontally installed heat pump probe port (8) is used for installing a horizontally arranged temperature probe to monitor the water temperature at a corresponding position in the pressure-bearing inner container (4). The arc surface part (42) at one end of the pressure-bearing inner container (4) is provided with a water circulation heat pump lower circulation port (3) and an obliquely installed heat pump probe port (10); the water circulation heat pump lower circulation port (3) is used for making water after heat exchange in the water circulation heat pump return to the pressure-bearing inner container (4); and the obliquely installed heat pump probe port (10) is used for installing an obliquely arranged temperature probe to monitor the water temperature in the pressure-bearing inner container (4) from different angles. The heat exchange layer (5) is provided with a heat exchange layer exhaust port (6) and a fluorine circulation coil pipe hole (9); the heat exchange layer exhaust port (6) is used for exhausting air generated or accumulated in the heat exchange layer (5) during operation; and the fluorine circulation coil pipe hole (9) is used for installing a fluorine circulation coil pipe, so that a fluorine circulation system can exchange heat with the medium in the heat exchange layer (5) through the coil pipe. A water supplement tank (15) is installed above the heat-insulated water tank (14), the water supplement tank (15) is connected with an external water source through a water supplement pipe (16), a water supplement valve (17) is installed on the water supplement pipe (16) to control the on-off of water flow to the water supplement tank (15); according to the direction of water flow, the water supplement pipe (16) is connected with the water inlet pipe (13) upstream of the water supplement valve (17), a water inlet valve (20) is further arranged upstream of the connection between the water supplement pipe (16) and the water inlet pipe (13) to control the on-off of water flow into the water supplement tank (15) or the pressure-bearing inner container (4); and a water supply valve (18) is arranged on the water inlet pipe (13) to control the on-off of water flow into the pressure-bearing inner container (4). ​ 2. The multi-functional pressure-bearing solar heat-retention water tank according to claim 1, characterized in that: ​ ​ ​ 3. The multi-functional pressure-bearing solar heat-retention water tank according to claim 2, characterized in that: ​ ​ ​ 4. The multi-functional pressure-bearing solar heat-retention water tank according to claim 3, characterized in that: ​ ​ 5. The multi-functional pressure-bearing solar heat-retention water tank according to claim 1, characterized in that: ​ 6. The multi-functional pressure-bearing solar thermal water tank according to claim 1, characterized in that: It also comprises a vacuum tube (11) and a support (12); one end of the vacuum tube (11) is connected with the heat exchange layer (5) through the heat preservation water tank (14) and the other end is fixedly connected with the support (12), which is used for absorbing solar heat and transferring to the heat exchange layer (5); The heat preservation water tank (14) is installed on the support (12), and the support (12) is used for supporting and fixing the heat preservation water tank (14) and the vacuum tube (11).

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